Hi Sarah, I'm glad to see this brought up. I was a 901 user for 8 months and then switched to the Riva. I got an adaptor for my 901 atti, but had a problem with
juice leaking at the base of the atti, so I just kinda gave up and used the 510 attys. But I miss my 901 flavor and I find the 510 to be a much harsher
vape. When I bought my Riva, I didn't know that they were available in the 901 style. When my 510 Riva dies I will be buying the 901. Hopefully by that time there will be someone on the forum who will have tried both and let me know what the difference is. It does seem that the Riva 510 cone is specifically designed to optimize the 510 atomizer, holding in the heat and warming the airflow. I'm wondering if the design of the Riva/eGo 901 optimizes IT'S design also. I would think that it would need to provide better airflow to do this. Anyone out there who has a Riva or eGo 901 I'd really like to hear from you.